J jon_jon_phenomenon New Member Mar 20, 2004 #1 hello How do i work out the size of battery required from this information 144 leds can turn on at one time forward voltage @ 20mA is: typ 2.1V max 3V im guessing: P = IV = 0.02 x 2.1 = 0.042W 0.042 x 144 = 6.048W then something to do with battery capacity? am i getting close?
hello How do i work out the size of battery required from this information 144 leds can turn on at one time forward voltage @ 20mA is: typ 2.1V max 3V im guessing: P = IV = 0.02 x 2.1 = 0.042W 0.042 x 144 = 6.048W then something to do with battery capacity? am i getting close?
R Russlk New Member Mar 20, 2004 #2 Batteries are rated in ampere-hours (AH). Multiply the current draw times the hours you want and get that size battery.
Batteries are rated in ampere-hours (AH). Multiply the current draw times the hours you want and get that size battery.
Josh New Member Mar 20, 2004 #3 a good battery can pretty much give up any amount of current (to a point) so it depends on how long you want the battery to last and how much space you've got. i'd get a big SLA 6V battery. Josh.
a good battery can pretty much give up any amount of current (to a point) so it depends on how long you want the battery to last and how much space you've got. i'd get a big SLA 6V battery. Josh.
J jon_jon_phenomenon New Member Mar 21, 2004 #4 ok thanks for replying im now wondering if i put two batteries together in series , does that change the AH? thanks again
ok thanks for replying im now wondering if i put two batteries together in series , does that change the AH? thanks again